Influence of the catalyst type (TiO<sub>2</sub>and ZnO) on the photocatalytic oxidation of pharmaceuticals in the aquatic environment

The 2nd International Electronic Conference on Water Sciences

2017

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This paper compared the removal degrees of selected contaminants of emerging concern, such as H2O2, O3, UV and UV/TiO2, in water solutions during advanced oxidation processes (AOPs). The tested micropollutants belong to the following groups: pharmaceuticals, dyes, UV filters, hormones, pesticides and food additives. The highest removal rate of pharmaceutical compounds was observed during the UV/TiO2 process. The decomposition of hormones in this process exceeded 96% and the concentration of the UV filter dioxybenzone was reduced by 75%. Toxicological analysis conducted in post-processed water samples indicated the generation of several oxidation by-products with a high toxic potential.

Section: Degradation Of Micropollutants In Aopmentioning

confidence: 99%

Decomposition of Contaminants of Emerging Concern in Advanced Oxidation Processes

The 2nd International Electronic Conference on Water Sciences

2017

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“…A higher efficiency was recorded for DCF whose concentration was reduced after 30 min of irradiation by more than 80%. Higher degrees of removal of the pharmaceutical compound in similar process conditions reaches 90% were observed by the use of TiO 2 as a mixture of anatase and rutile [36]. However, the presence of rutile does not positively affect the removal of BPA [37].…”

Section: Membrane Application For Pharmaceutical Removalmentioning

confidence: 99%

TiO₂ immobilised on biopolymer nanofibers for the removal of bisphenol A and diclofenac from water

Ecological Chemistry and Engineering S

Silvestri

Stuchlík

et al. 2017

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Abstract:Recently electrospinning has gained significant attention due to unique possibilities to produce novel natural nanofibers and fabrics with controllable pore structure. The present study focuses on the fabrication of electrospun fibres based on gum karaya (GK), a natural tree gum, with polyvinyl alcohol (PVA), and functionalization of the membrane with TiO2 nanoparticles with further methane plasma treatment. The GK/PVA/TiO2 membrane was analyzed with several techniques including: fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), and water contact angle, in order to characterize its morphological and physicochemical properties. The GK/PVA/TiO2 membrane was further successfully used for the degradation (under UV irradiation) of bisphenol A and diclofenac from aqueous solution. It was also observed that the degradation kinetics of these compounds are faster in comparison to the UV treatment alone.

“…As an example, the mechanism of DCF decomposition in a solution with NaHCO 3 runs very rapidly within the first 5 min of UV irradiation, with the half-life of the compound reaching 11.9 min, and after 15 min of irradiation the oxidation process stops and the reaction rate constant decreases by almost three times. The reason behind this observation may be so called scavenging of hydroxyl radical by HCO − 3 ions and producing carbonate radicals according to Reaction (8) or blockage of active centres of photocatalyst. Further irradiation of the solution results in re-acceleration of the oxidation and/or reduction of DCF, whereas the half-life of the compound decreases from 63.2 to 56.4 min.…”

Section: Influence Of Inorganic Anionsmentioning

confidence: 99%

“…One of the methods that guarantees high removal rates of organic substances including pharmaceutical compounds [7][8][9] is the process of heterogenic photocatalysis conducted with the application of catalysts of a different type; out of them nanomolecules of Titanium dioxide (TiO 2 ) are described in the literature most frequently [10].…”

Section: Introductionmentioning

confidence: 99%

Influence of Inorganic Ions and Organic Substances on the Degradation of Pharmaceutical Compound in Water Matrix

Dudziak

Bohdziewicz

2016

Water

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Abstract:The paper determined the influence of inorganic substances and high-molecular organic compounds on the decomposition of diclofenac, ibuprofen, and carbamazepine in the process of photocatalysis conducted with the presence of Titanium dioxide (TiO 2 ). It was determined that the presence of such ions as CO affected the increase of reaction rate constant value of diclofenac and ibuprofen decomposition. On the other hand, high molecular organic compounds present in the model effluent additionally catalysed the degradation process of pharmaceutical compounds and constituted an additional sorbent that enabled to decrease their concentration. Toxicological analysis conducted in deionized water with pharmaceutical compounds' patterns proved the production of by-products from oxidation and/or reduction of micropollutants, which was not observed for model effluent irradiation.